According to the story, the 900 Yosemite campsites can be reserved for $20 a night through the website ReserveAmerica, but park officials say they've seen Craigslist posts listing prices as high as $100 to $150 a night for the same reservations. Permits to climb Half Dome are also popping up for sale.

Rather than waiting for an official solution, users of the web forum YosemiteNews.info are picking out the posts on Craigslist sites around the country and posting them to the site so they'll be flagged as abusive by other users and taken down. On Thursday alone there were more than two dozen posts on the forum identifying possible scalpers.